Twenty years ago, Basilio, King of Polonia, was told that his son Sechismundo would bring death and discord to the family and attempt to kill his father. Basilio is even more frightened when his wife dies in childbirth. In the end, the king decides not to risk his throne and life and sends little Sehismundo to prison, depriving him of all the rights of the rightful heir. But two decades later, Basilio repents of his deed and decides to return everything that he took away to his son and test him with power.